Date: Wed, 14 Mar 2007 09:41:57 -0400 From: "Justin T. Gibbs" <gibbs@scsiguy.com> To: aic7xxx@freebsd.org Subject: Re: Adaptec 2940UW with Fujitsu MAN3184M Message-ID: <45F7FBA5.4010404@scsiguy.com> In-Reply-To: <20070314121250.GB2553@radix50.net> References: <20070228204034.GA2379@radix50.net> <45E602B3.2020306@paralan.com> <20070228233314.GA7348@radix50.net> <45E77B30.2090505@paralan.com> <20070302220950.GD7331@radix50.net> <45E8C36C.1020407@paralan.com> <20070314121250.GB2553@radix50.net>
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Baurzhan Ismagulov wrote: > > I've done some tests (hdparm -tT, build the Linux kernel with ccache) > and have seen that my SATA 7.2k ST3320620AS outperforms U160 10k > MAN3184M by up to 30%, so I decided not to use it for the rootfs yet. Make sure you run a fair test. Most SCSI drives are shipped from the factory with the write cache set to "write-through". SATA and ATA drives almost always operate in "write-back" mode. Your 29160 BIOS should have an option to set the caching mode on a per-target basis. If you're system is backed up by a UPS or your FS can handle being lied to, write-back is fine. Otherwise it's really not a safe option. -- Justin
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